<template>
  <span class="undo" v-if="obj.result===null">{{index+1}}: 未完成</span>
  <span class="right" v-else-if="obj.left+obj.right===obj.result">{{index+1}}:正确</span>
  <span class="error" v-else>{{index+1}}:错误</span>
</template>

<script>
export default {
  props:{
    obj:{
      type: Object,
      required: true
    },
    index:{
      type: Number,
      required: true
    },
  }
};
</script>

<style scoped>
.right {
  color: green;
}
.error {
  color: red;
}
.undo {
  color: #ccc;
}
</style>
